JPS5937611Y2 - water heater - Google Patents

Description

[Detailed explanation of the idea] [Technical field of invention] This invention relates to improvement of water heaters.

[Conventional technology]

In conventional water heaters, hot water is supplied by opening the hot water faucet connected to the hot water tank via the hot water pipe, but when the hot water supply is shut off (when it is not needed), the button is turned off and the piping between the hot water tank and the hot water faucet (
The temperature of the hot water inside the hot water supply pipe decreases as heat is removed from the pipe to the outside.

For this reason, when the hot water tap is opened, low-temperature hot water is supplied for a while, and the hot water temperature does not rise unless several liters are wasted.

[Summary of the idea]

This idea was devised in view of the above-mentioned drawbacks; it maintains the hot water in the hot water supply pipe at a predetermined vorticity, so that when the hot water tap is opened, hot water is always above the predetermined temperature, and the hot water supply location is located on the second floor or elsewhere. It is an object of the present invention to provide a hot water supply device that can obtain sufficient discharge pressure from a hot water tap even in a high place.

[Example of idea]

Below 1. An embodiment of this invention will be described with reference to FIG. 1. In the figure, 1 is a source pressure tank connected to a water supply system such as a water pipe 2 via a water source valve 3, and 4 is a source pressure tank provided downstream of this pressure reducing valve 1. , a hot water tank having a pressure vessel structure heated by a burner or the like and having a low water supply pressure, 5 a plurality of hot water taps connected to the upper part of the hot water tank 4 via a hot water supply pipe 6, and T installed in the hot water supply pipe 6; One end of the safety valve 8 connected to the hot water pipe 6 near the hot water tap 5 provided farthest from the hot water tank 4 among the plurality of hot water taps 5, and the other end connected to the lower part of the hot water tank 4. In the return pipe, there is a temperature sensor 10 that detects the temperature inside the pipe and sends a drive signal to the pump 9, and a check 9f11.
and an orifice 12 for controlling the flow rate in the return pipe 8.

9 is a pump installed between the hot water tap 5 of the hot water pipe 6 and the hot water tank 4 with its discharge side facing the hot water tap 5; 13 is a flow switch which is a pressure reducing valve 3 in the water supply system of the hot water tank 4;
It is provided in a pipe provided on the downstream side of the pipe.

Reference numeral 14 denotes a faucet connected to the pipe body provided with the flow switch 13, and is provided adjacent to or coupled to the hot water faucet 5 (in the case of a mixed faucet) adjacent to the return pipe 8.

The pump 9 is driven by an OR circuit of the temperature sensor 10 and the flow switch 13.

However, the OR circuit is configured to give priority to the flow switch 13.

In the water heater configured as described above, the heated hot water in the hot water tank 4 can be adjusted to the water supply pressure by opening the hot water tap 5 on the lower side of the diagram or opening the hot water tap 5 and the water tap 14 on the upper side of the diagram. Powered by.

On the other hand, by closing the hot water tap 5, the temperature of the hot water in the hot water pipe 6 is lowered.

The temperature of this hot water is detected by a temperature sensor 10 installed in the return pipe 8, and if the temperature falls below a predetermined temperature, the pump 9 is activated to circulate the hot water in the hot water tank 4 and supply high temperature hot water into the pipe. However, no matter when the hot water tap 5 is opened, hot water at a predetermined temperature or higher can be obtained.

Figure 2 shows the change in the water temperature inside the pipe at this time.

(If the temperature sensor is set to 80°C OFF.45°C OFF) The orifice 12 is provided so that a predetermined pressure is applied to the hot water tap 5, and it functions more effectively when the hot water tap 5 is installed in a high place. .

In addition, the heat loss when circulating with a pump is 80 kcal/h when the pump is operated intermittently in a 20 m pipe, and 1200 kcal/h when the pump is continuously operated.

When the hot water tap 5 is installed in a high place such as the second floor, the water tap 14 is installed via a water supply pipe equipped with a flow switch 13 that branches downstream of the pressure reducing valve 1.
The pump 9 is driven by the operation of the flow switch 13 by opening the hot water tap 4, and thereby a sufficient discharge amount (pressure) of the hot water tap 5 can be obtained.

That is, the discharge pressure of the pump 9 can be effectively used not only for circulating hot water but also for supplying hot water.

[Effect of idea]

As is clear from the above explanation, the water heater of the present invention is
The pump that circulates hot water in the piping to which water supply pressure is applied is configured to operate based on a signal from either a temperature sensor installed in either the hot water supply pipe or the return pipe and a flow switch that is activated by the operation of the water tap. Moreover, since the pump is built into the hot water pipe connected to the hot water tank where the water supply pressure is low, it is possible to prevent hot water from becoming cold water when hot water is not being supplied by circulating hot water using the pump. At the same time, the same pump can increase the discharge pressure to the hot water tap when supplying hot water.

Therefore, it can sufficiently cope with supplying hot water to high places such as the second floor.

[Brief explanation of drawings]

FIG. 1 is a pipe diagram showing an embodiment of this invention, and FIG. 2 is a graph showing changes in hot water temperature within the pipe. In addition, the same reference numerals in each figure indicate the same or equivalent parts, and 1
is a pressure reducing valve, 4 is a hot water tank, 5 is a hot water tap, 6 is a hot water pipe,
8 is a return pipe, 9 is a pump, 10 is a temperature sensor, 12 is an orifice, and 13 is a flow switch.

Claims (1)

[Scope of utility model registration request] Related to hot water supply systems in which hot water taps are installed at a predetermined height difference, such as on the first and second floors of a house, through hot water pipes to a hot water tank with a pressure vessel structure that is connected to the water supply system and receives water supply pressure. The water supply system is provided with a water supply faucet that is close to or connected to the hot water supply faucet via a pipe body provided with a flow switch, and a water supply pipe that connects the hot water supply faucet and the hot water tank is provided with A pump is installed with the discharge side facing the hot water tap side, and a return pipe is provided at the end of the hot water pipe that communicates with the hot water tap, the end of which communicates with the hot water tank and has a flow rate control section in the middle, and the pump: The hot water supply device is characterized in that it is operated by a signal from either a temperature detector provided in either the return pipe or the hot water supply pipe and operated by detecting a low temperature, and the flow switch.